ADC
ALERT
SPI
V
REF
Small Form Factor Solution for Multiple Input Types
V
TH
ADS816x
AIN0
CS
SDI
SDO
CS
MISO
MOSI
16-MHz
Lowest Clock Speeds at 1-MSPS using 4-Wire Enhanced-SPI
MCU
ISO
(optional)
ADC Conversion
Data
Read
ADC Conversion
Enhanced SPI SPI
16-MHz
52-MHz
Quiet time
Data
Parity
+
+
±
AIN
X
Data
AIN
X
Data
HI threshold
LO threshold
Single external op-amp
(optional)
AIN1
AIN7
MUX
Data Read
SCLK
SCLK
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. ADVANCE INFORMATION for pre-production products; subject to
change without notice.
ADS8166
,
ADS8168
SBAS817A –NOVEMBER 2017–REVISED JULY 2018
ADS816x 8-Channel, 16-Bit, 1-MSPS SAR ADC With Easy to Drive Analog Inputs
1
1 Features
1
• Compact Low Power Data Acquisition System:
– MUX Breakout Enables Single External Driver
Amplifier
– Single-Supply Operation
– 16-Bit SAR ADC
– Low Drift Integrated Reference and Buffer
– 0.5 × V
REF
Output for Analog Input DC Biasing
• Excellent AC and DC Performance:
– SNR: 92-dB, THD: –110-dB
– INL: ±0.3-LSB, 16-Bit No Missing Codes
• Low Leakage Multiplexer With Sequencer:
– Multiple Channel Sequencing Options:
– Manual Mode, On-the-Fly Mode, Auto
Sequence Mode, Custom Channel
Sequencing
– Early Switching Enables Direct Sensor
Interface
– Fast Response Time with On-the-Fly Mode
• System Monitoring Features:
– Per Channel Programmable Window
Comparator
– Alert Output for MCU Interrupt
– False Trigger Avoidance With Programmable
Hysteresis
• Enhanced-SPI Digital Interface:
– 1-MSPS Throughput With 16-MHz SCLK
– High-Speed, 70-MHz Digital Interface
• Wide Temperature Range: –40°C to +125°C
2 Applications
• Optical Line Cards
• Data Acquisition Cards
• Test and Measurement
• Patient Monitoring
• PLC Universal Analog Input Module
3 Description
The ADS816x is a family of 16-bit, 8-channel, high-
precision successive approximation register (SAR)
analog-to-digital converters (ADCs) operating from a
single 5-V supply with 1-MSPS (ADS8168) and
250-kSPS (ADS8166) total throughput.
The input multiplexer supports extended settling time,
which makes driving the analog inputs easier. The
output of the multiplexer and ADC analog inputs are
available as device pins. This configuration allows
one ADC driver op amp to be used for all eight
analog inputs of the multiplexer. The ADS816x
simplifies processing of data with an enhanced
channel sequencer, which reduces software
complexity.
The ADS816x device family features a digital window
comparator with programmable high and low alarm
thresholds with hysteresis per analog input channel.
The single op-amp solution with programmable alarm
thresholds enables low power, low cost, and smallest
form factor applications.
Device Information
PART NUMBER PACKAGE BODY SIZE (NOM)
ADS816x VQFN (32) 5.00 mm × 5.00 mm
(1) For all package options refer to mechanical drawing section at
the end of the datasheet.
ADS816x Application Topologies
